Food supply and external cues limit the clutch size and hatchability in the White Stork Ciconia ciconia

• Autorzy: Djerdali S , Tortosa F.S. , Hillstrom L. , Doumandji S.

Warianty tytułu

PL

Wplyw dostepnosci pozywienia oraz czynnikow klimatycznych na wielkosc zniesienia i sukces klucia u bociana bialego

• Języki publikacji: EN

Abstrakty

EN

Clutch size is an important life history trait, and factors such as nest predation and food availability can both be of crucial importance for its variation in nature. The aim of the present study was to evaluate the effects of extra food on clutch size, laying date and hatching success in the White Stork. Three different colonies of White Storks were studied in northern Algeria over a three-year period (2002-2004) that was characterised by considerable variation in both food availability and precipitation. This study demonstrated that an extra food supply during the pre-laying period had a positive effect on clutch size — nests with extra food had larger clutches. There was also an advance in laying date and a greater hatching success in nests with access to extra food. In addition to food supply, clutch size was independently affected by the year, which could have been due to differences in rainfall. Furthermore, the results of this study suggest that extra food during the incubation period could help the parent birds resolve the conflict between incubation behaviour and minimizing the time off the nest, i.e. increasing nest attentiveness in nests with extra food and enhancing hatching success.

PL

Aby określić związek między ilością pokarmu a elementami biologii lęgów często stosuje się eksperymenty, w których ptakom podawane jest dodatkowe pożywienie. W pracy zbadano jak dostęp do dodatkowego źródła pokarmu, jakim były reszki z ferm drobiu wpływa na wielkość zniesienia, termin przystępowania do lęgu i sukces klucia u bociana białego w północnej Algierii. Badania prowadzono przez 3 lata (2002-2004) w trzech koloniach bocianów, w ciągu dwóch sezonów w okolicach dwóch z nich działały kurze fermy, a badane ptaki żerowały na odpadkach poprodukcyjnych. Prócz tego w badanym okresie sezony różniły się mocno ilością opadów. Wykazano, że dostęp do dodatkowego pokarmu w okresie przedlęgowym wpływa na zwiększenie zniesienia, szybsze przystępowania do lęgów i wyższy sukces klucia (Tab. 2). Prócz tego wielkość zniesienia różniła się między sezonami, co może wskazywać na związek z klimatem i ilością opadów (Tab. 1). Dodatkowe pożywienie podczas wysiadywania pomaga ptakom dorosłym rozwiązać konflikt pomiędzy zaangażowaniem rodzicielskim a znajdowaniem pożywienia dla siebie, a więc zmniejszać czas spędzany poza gniazdem, przez co sukces klucia jest większy.

Słowa kluczowe

EN

Ciconia ciconia; ornithology; food supplementation; feeding; life history; White Stork; hatching success; bird; hatchability; cluth size; laying date

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2008
• Tom: 43
• Numer: 2
• Opis fizyczny: p.145-150,ref.

Twórcy

autor

Djerdali S

• Universite Farhat Abbes, 19000 Setif, Algeria

autor

Tortosa F.S.

autor

Hillstrom L.

autor

Doumandji S.

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